Coal pulverizer and feeder



June 7, 1932- o. E. BORNHAUSER 1,861,779

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June 7, 1932. o. E. BORNHAUSER 1,861,779

COAL PULVERIZER AND FEEDER Filed Aug. l, 1930 2 Sheets-Sheet 2 Patented June 7, 1932 UNITED STATES PATENT OFFICE- OTTO E. BOBNHAUSEB, F SANDUSKY,A OHIO, '-ASSIGNOR TO HER-BORN ENGINEERING AND\IANUFACTUBING COMPANY, OF SANDUSKY, OHIO, A CORPORATION con. PULVERIZEB AND FEEDER A11-Initiation. led August 1, 1930. Serial No. 472,479.

In view of the high efficiency obtainable from the combustion of powdered fuel devices have been proposed for feeding pu verized fuel into a burner or furnace therefor,

6 to effect the automatic stoking of the furnace.

AThe present invention relates to such automatic stokers, embracing a type of Stoker which is adapted to pulverize uel fed into the device and to continuously blow the pulverized fuel into a furnace, resulting in the burning of a very substantial amount of the fuel while in suspension, the heavier particles burning on the grates to maintain the fire bed to ignite an incoming stream of fuel.

The present invention provides a stoker comprising a conveyor and pulverizer driven by a motor, the conveyor being regulatable to deliver in a given time a predetermined amount of fuel to the pulverizer, and it possesses the advantages of including a combined pulverizing and blowing unit of increased eiiiciency, simple means for separating from the fuel foreign materials which may be associ'ated with the fuel and not affected by the fuel crushing means, to prevent clogging of the crusher through accumulation of. such foreign materials therein, and in the provision of means for feeding a regulated predetermined amount of fuel tothe combined crusher and blowing mechanism. v

Other objects and advantages will become apparent from a consideration of the followin description.

e invention will be more readily understood by reference to the accompanying drawings, in which- Figure 1 is a side perspective view ofl a unit constructed in accordance with this invention. v

Figure 2 is a detailed view of a conveyor.

" 'Figure 3 is a perspective view of a pulverizer showing the interiorthereof, and

Figure 4 represents, diagrammatically, an installation embodying the present unit.

Referring more particularly to the drawings, 1 represents a hopper communicating with t e interior of a conveyor housing 11, the housing communicatin witha ulverizer 12, the conveyor and p verizer ing operated by the motor 13which drives a shaft 14. For driving the conveyor, the shaft 14 is geared to the wheel 15, carrying a shaft 16 which operates a. crank 17 to drive the rod 18, which in turn operates a crank 19 to drive the ratchet wheel 20. The ratchet 20 operates a conveyor 21, the conve or being conveniently of the screw type, t e conveyor shaft being represented at 22.

The pulverizer 12 is provided with a lining 23 which is formed of corrugated material highly resistant to abrasion, such for example as case hardened steel, or well known alloys of steel of suicient hardness to resist abrasion, the materials to be crushed passing into the interior of the pulverizer through the conduit 24.

Within the pulverizer is a spider 25 driven by the motor shaft 14 and adapted to rotate at relatively high velocity, the spider 25 carrying pivoted hammers 26, 27, and 28 which serve as Crushers, te other arms carrying relatively large Hat members 29, 30, and 31 which serve as the principal fan blades to blow the pulverized fuel through the outlet 32, the fanning action being asslsted by relatively smaller auxiliary blades 33, 34, and35 carried on the arms which carry the hammers. For maximum eliciency, the principal fan blades alternate with the'y hammers.

The outlet 32 is connected by means of connector 36, provided with a Y or T connection 37 and pipes 38 and 39 leading therefrom to a furnace 40.

To facilitate the blowing of the fuel fromthe pulverizer the conveyor housing 11 is provided with a port 41` controlled by a movable cover 42, so that when the spider 25 rotates airl will be drawn through the port 41 in quantities regulatableby the cover 42.

It will also be seen from Figure 1 that the ratclfet 20 is provided with; a guard 43, the guard being connected as shown at 44 with a rod 45 rovided with a plurality of notches 46 whic engage a pin 47 on the housing of the pulverizer 12. A pawl/.1.8 is pivoted on the crank 19, and by means of the rod 45 and notches 46 the position of the guard may be adjusted so as to permit the pawl 48 to engage a regulatable predetermined number of notches of the ratchet wheel 20 so that the distance which the conveyor is moved at each stroke of the rod 18 can be adjusted with consequent regulation of the amount of fuel brought into the pulverizer by the conveyor at each stroke of the rod.

It will be seen in Figure 3 that the lining 23 in the casing of the pulverizer 12 is provided with a cut-away portion 49, this defining a recess for the collection of heavy foreign material associated with the coal passing into the pulverizer, the material collecting in this recess from which it may be readily withdrawn, assuring a clean supply of fuel passing out through the opening 32 and at the same time keeping the pulverizer from becoming clogged by the accumulation of such foreign matter. The withdrawal is made bv suitable means.

It will be understood that the pulverizer 12 is normally closed by means of a. removable cover 52.

In operation coal is supplied to the hopper 10 in lumps of a size which will be acted upon by the conveyor 21, being thus brought down and dropped through the conduit 24 into the pulverizer 12. The arms of the spider 25 rotating at high speed pulverize the coal thus introduced and blow the coal when pulverized in a continuous stream through the outlet 32 through the pipes 38 and 39 into the furnace 40, where the particles which are suiiiciently fine are burned while in suspension, the coarser particles burning on the grates, thus maintaining a fire bed to ignite the incoming stream of coal. The amount of coal delivered by the conveyor to the pulverizer may be adjusted, as above pointed out, by adjusting the guard 43 in a desired position.

It will be apparent that many changes may be made in the details of the construction s1 ecifically described and illustrated herein, which is to be regarded as an example of one of the forms which the invention may take; and it will be obvious that such changes in owing action of the signature. AUSER.

details may be made without departing from i the inventive concept. It will accordingly be understood that it is intended and desired to embrace within the scope of this invention such modifications and changes as may be necessary to adapt it to varying conditions and uses. v

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is

1. In a device of the character described, a pulverizer comprising a spider adapted to be rotated at relatively high velocities and provided with a plurality of arms, pulverizing hammers pivotally mounted on certain of the arms, relatively large flat fan blades carried by the other arms adapted to continuously blow pulverized material from the pulverizer, and relatively small auxiliary Hat on the pulverizing 

